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N55 Engine
Turbocharger
The N55 is equipped with a single twin scroll turbocharger instead of two separate small
turbochargers as on the N54 engine. The following graphics shows the operating princi-
ple of the twin scroll turbocharger.
Twin scroll turbocharger rear view
Index Explanation Index Explanation
A
Exhaust duct 1 (cylinders 1 - 3)
2
Lever arm, wastegate valve
B
Exhaust duct 2 (cylinders 4 - 6)
3
Vacuum unit for wastegate valve
C
Connection to catalytic converter
4
Diverter valve
D
Inlet from intake silencer
6
Turbine wheel
E
Ring channel
8
Cooling duct
F
Outlet to intercooler
10
Oil return
1
Wastegate valve
11
Coolant return
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